content: /*
   * Copyright 2017 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.reactive4javaflow.impl.consumers;
  
  import hu.akarnokd.reactive4javaflow.*;
  import hu.akarnokd.reactive4javaflow.errors.CompositeThrowable;
  
  import java.util.concurrent.Flow;
  
  public final class SafeFolyamSubscriber<T> implements FolyamSubscriber<T>, Flow.Subscription {
  
      final FolyamSubscriber<? super T> actual;
  
      Flow.Subscription upstream;
  
      boolean done;
  
      public SafeFolyamSubscriber(FolyamSubscriber<? super T> actual) {
          this.actual = actual;
      }
  
      @Override
      public void onSubscribe(Flow.Subscription subscription) {
          upstream = subscription;
          try {
              actual.onSubscribe(this);
          } catch (Throwable ex) {
              done = true;
              cancel();
              FolyamPlugins.onError(ex);
          }
      }
  
      @Override
      public void onNext(T item) {
          if (done) {
              return;
          }
  
          try {
              actual.onNext(item);
          } catch (Throwable ex) {
              cancel();
              onError(ex);
          }
      }
  
      @Override
      public void onError(Throwable throwable) {
          if (done) {
              FolyamPlugins.onError(throwable);
              return;
          }
          done = true;
          try {
              actual.onError(throwable);
          } catch (Throwable ex) {
              FolyamPlugins.onError(new CompositeThrowable(throwable, ex));
          }
      }
  
      @Override
      public void onComplete() {
          if (done) {
              return;
          }
          done = true;
          try {
              actual.onComplete();
          } catch (Throwable ex) {
              FolyamPlugins.onError(ex);
          }
      }
  
      @Override
      public void request(long n) {
          try {
              upstream.request(n);
          } catch (Throwable ex) {
              cancel();
              FolyamPlugins.onError(ex);
          }
      }
  
      @Override
      public void cancel() {
          try {
              upstream.cancel();
          } catch (Throwable ex) {
              FolyamPlugins.onError(ex);
          }
      }
  }
  